OOS 36
Drought and Tree Mortality: Linking Experimental Results and Observations With Predictive Models.

Thursday, August 14, 2014: 8:00 AM-11:30 AM
304/305, Sacramento Convention Center
Melanie Zeppel, Macquarie University
Henry D. Adams, Los Alamos National Laboratory; William Anderegg, Stanford University; and Michael W. Jenkins, University of California, Santa Cruz
Michael W. Jenkins, University of California, Santa Cruz
Recent advances in ecological and physiological research scaling from individual plant to ecosystems and across geographic ranges from coasts to mountains, deserts to the tropics have progressed our understanding of the complex process through which trees die from drought and temperature stress. Much comparative work in drought response across species and ecosystems has occurred in the past few years. Recent and forthcoming experiments, observational and modeling studies across plant functional types have begun to illuminate the interlinked changes in tree carbon status, water relations, and biotic agent damage with the goal of improving prediction of which species and regions are likely to die in future climates. Despite recent progress, major uncertainties remain both in how trees succumb to drought and biotic agent attack and in understanding cross-species and cross-biome differences necessary to inform modeling efforts. This session seeks to capture the forefront of this exciting research area by integrating cutting-edge physiological research on single species/ecosystems with cross-system comparisons and syntheses. This session is linked with and explicitly designed to be complementary with another ESA session on non-structural carbohydrates, which will touch on carbohydrates and tree stress but not focus on mortality directly. This session covers a mix of causes and consequences of drought-induced mortality, as well as modeling, experimental and observational studies. We have confirmations from a mix of early career scientists, and established professors providing overviews of recent drought-induced mortality research. We have included a wide-range of speakers from the Americas, Australia, and Europe who will provide insights into experiments and modeling across a broad range of ecosystems. Most speakers will be presenting innovative and currently unpublished research of interest to the broader field of ecology. Several speakers will present from across a number of systems, including cross-species comparisons and meta-analysis techniques. Others will provide results from the latest, in-depth research on the physiology of drought-induced tree mortality including the effects of increased atmospheric CO2, temperature, and drought. Additionally, several speakers will address recent work applying insights from recent mortality research into models that seek to predict forest loss with climate change.
8:00 AM
 Dynamics of leaf water relations components in co-occurring iso- and anisohydric conifer species
Frederick C. Meinzer, USDA Forest Service; David R. Woodruff, USDA Forest Service; Danielle E. Marias, Oregon State University; Katherine A. McCulloh, The University of Wisconsin-Madison; Sanna Sevanto, Los Alamos National Laboratory
8:20 AM
 Strong functional divergence in the evolution of drought tolerance of the Coniferales
Tim Brodribb, University of Tasmania; Scott AM McAdam, University of Tasmania; Samuel Martins, University of Tasmania; Gregory J. Jordan, University of Tasmania
8:40 AM
 Does inclusion of plant hydro-dynamics improve drought-response predictions of dynamic vegetation models?
Thomas Powell, Harvard University; ACL da Costa, Federal University of Para; Patrick Meir, University of Edinburgh; Scott R. Saleska, University of Arizona; Paul Moorcroft, Harvard University
9:00 AM
 Effects of precipitation and temperature manipulations on carbohydrate and mortality dynamics in piñon-juniper woodlands
L. Turin Dickman, Los Alamos National Laboratory; Nate G. McDowell, Los Alamos National Laboratory; Sanna Sevanto, Los Alamos National Laboratory; William T. Pockman, University of New Mexico
9:20 AM
 Drought and hydraulic thresholds: Predicting the mortality of woody plants of Patagonian forests and deserts
Sandra J. Bucci, Departamento de Biologia (UNPSJB) and Comision Nacional de Investigaciones Cientificas y Tecnicas (CONICET); Guillermo Goldstein, Laboratorio de Ecologia Funcional, FCEyN-UBA and CONICET; Fabian G. Scholz, Comision Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
9:40 AM
9:50 AM
 Recovery from drought -induced embolism and mortality of multiple species across a rainfall gradient, from rainforest to semi-arid
Melanie J.B. Zeppel, Macquarie University; Henry D. Adams, Los Alamos National Laboratory; Patrick J. Hudson, University of New Mexico- Albuquerque; William R. L. Anderegg, Princeton University; Derek Eamus, University of Technology, Sydney; David T. Tissue, Hawkesbury Institute for the Environment, University of Western Sydney, Richmond NSW
10:10 AM
 A multiple species synthesis of tree mortality physiology – how prevalent are hydraulic failure and carbohydrate depletion?
Henry D. Adams, Los Alamos National Laboratory; The Multi-Species Tree Mortality Review Team, NA
10:30 AM
 Carbon dynamics during drought-induced mortality - in search of the missing sink
Henrik Hartmann, Max Planck Institute for Biogeochemistry; Nate G. McDowell, Los Alamos National Laboratory; S. E. Trumbore, Max Planck Institute for Biogeochemistry
10:50 AM
 Indirect effects of climate on mountain pine beetle eruption, spread, and invasive potential
Devin W. Goodsman, University of Alberta; Caroline Whitehouse, Alberta Environment and Sustainable Resource Development; Maya L. Evenden, University of Alberta; Barry Cooke, Canadian Forest Service, Northern Forestry Centre; Mark, A. Lewis, University of Alberta
11:10 AM
 Diversity and drought: Exploring hydraulic failure and carbon limitation of plant functional types in a South African shrubland
Adam G. West, University of Cape Town; Robert P. Skelton, University of Cape Town; Todd E. Dawson, University of California Berkeley